THIS is last known picture of missing Amelia Bambridge, taken just hours before her disappearance. 

The backpacker from Worthing vanished on Wednesday night after a beach party in Koh Rong, Cambodia, on Wednesday. 

Yesterday, volunteers and police who set up a search party found her pink and black flowered rucksack as they scoured the holiday isle where she was staying.

Today, Amelia's family have released this picture of her, which shows her at the beach party. 

READ MORE: Everything we know about the disappearance of Amelia Bambridge

The former Bhasvic student is on a gap year and travelling alone for the first time.

She was due to check out of her youth hostel at noon on Friday to leave the island later in the afternoon with a friend.

But ten hours later, at 10pm local time, her mother Linda was told by the hostel’s manager that her daughter had “been declared officially missing”.

Cambodian Police and volunteers scoured the remote island, which is about 30 square miles, for Amelia on Saturday and Sunday.

READ MORE: Everything we know about the disappearance of Amelia Bambridge

They are searching the jungle, mountains, creeks, beaches and all the places Amelia had visited, enlisting help from their diving teams. 

Events and parties which had been organised for the holiday island have been called off as fellow backpackers assist police.